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Re: RDF-ISSUE-140 (dataset-comparison): RDF Dataset Comparison (Ivan Herman) [RDF Concepts]

From: Pat Hayes <phayes@ihmc.us>
Date: Sat, 10 Aug 2013 07:50:19 -0700
Cc: "'RDF Working Group'" <public-rdf-wg@w3.org>
Message-Id: <B5F34882-3D3C-4C21-994D-DEF9C6EACA54@ihmc.us>
To: Markus Lanthaler <markus.lanthaler@gmx.net>

On Aug 9, 2013, at 12:24 AM, Markus Lanthaler wrote:

> On Friday, August 09, 2013 12:20 AM, Gavin Carothers wrote:
>> For clarity
>> 
>> {
>>  {
>>    _:y rdf:type ex:graphsIlike .
>>  }
>>  _:y {
>>    ex:a ex:b ex:c}
>>  }
>> }
>> ########
>> 
>> {
>>  {
>>    _:x rdf:type ex:graphsIlike .
>>  }
>>  _:x {
>>    ex:a ex:b ex:c}
>>  }
>> }
>> 
>> MUST be isomorphic if we expect to have test cases for parsing
>> datasets.
> 
> Gavin, could you please explain ... why the first dataset isn't isomorphic to
> 
> {
>  {
>    _:y rdf:type ex:graphsIlike .
>  }
>  _:x {
>    ex:a ex:b ex:c}
>  }
> }
> 

The scope of bnode IDs is the entire dataset, because they can be shared between graphs in a dataset. So the first one of these has one bnode in it, and the second has two bnodes in it. Not isomorphic. 

Pat

> 
> Thanks,
> Markus
> 
> 
> --
> Markus Lanthaler
> @markuslanthaler
> 
> 
> 

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Received on Saturday, 10 August 2013 14:50:53 UTC

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